[GHC] #9173: Better type error messages

[GHC]

#9173: Better type error messages
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        Reporter:  simonpj           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by thoughtpolice):

 I like this, and think the second set of output reads much, much better.
 Bonus points: use ANSI terminal colors to highlight some key words in the
 output, such as "Warning" or "Error" should they exist.

 Lennart also makes an observation about the way the Mu Haskell compiler
 handles this:
 https://pay.reddit.com/r/haskell/comments/26tcrk/curious_with_a_bit_of_beginner_ranting_about_some/chuwwns

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9173#comment:1>
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